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Biological Flora of the British Isles: Ambrosia Artemisiifolia

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Biological Flora of the British Isles: Ambrosia Artemisiifolia Article Type: Biological Flora BIOLOGICAL FLORA OF THE BRITISH ISLES* No. 278 List Vasc. Pl. Br. Isles (1992) no. 135, 74, 1 Biological Flora of the British Isles: Ambrosia artemisiifolia Franz Essl1,2,†, Krisztina Biró3, Dietmar Brandes4, Olivier Broennimann5, James M. Bullock6, Daniel S. Chapman7, Bruno Chauvel8, Stefan Dullinger1,9, Boris Fumanal10,11, Antoine Guisan5,12, Gerhard Karrer13, Gabriela Kazinczi14, Christoph Kueffer15, Beryl Laitung16, Claude Lavoie17, Michael Leitner18, Thomas Mang1, Dietmar Moser1, Heinz Müller-Schärer19, Blaise Petitpierre5, Robert Richter20, Urs Schaffner21, Matt Smith22, 23 24 20 25 Uwe Starfinger , Robert Vautard , Gero Vogl , Moritz von der Lippe and Swen 26 Article Follak 1Department of Botany and Biodiversity Research, Division of Conservation, Vegetation and Landscape Ecology, University Vienna, Rennweg 14, 1030 Vienna, Austria; 2Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Private Bag 91, Matieland 7602, South Africa; 3University of Pannonia, Georgikon Faculty, Institut for Plant Protection, 8361 Keszthely, Deák F.str. 16, Hungary; 4Technical University Braunschweig, Institute for Plant Biology, Mendelsohnstraße 4, 38106 Braunschweig, Germany; 5Department of Ecology & Evolution, University of Lausanne, 1015 Lausanne, Switzerland; 6NERC Centre for Ecology & Hydrology, Benson Lane, Wallingford, Oxfordshire OX10 8BB, UK; 7NERC Centre for Ecology & Hydrology, Bush Estate, Edinburgh EH26 0QB, UK; 8INRA, UMR1347 Agroécologie, 21000 Dijon, France; 9Vienna Institute for Nature Conservation & Analyses, Giessergasse 6/7, 1090 Vienna, Austria; 10Clermont Université, Université Blaise-Pascal, UMR547 PIAF, BP 10448, 63000 Clermont-Ferrand, France; 11INRA, UMR547 PIAF, 63100 Clermont-Ferrand, France; 12Institute of Earth Surface Dynamics, University of Lausanne, 1015 Lausanne, Switzerland; 13Institute of Botany, University of Natural Resources and Life Sciences Vienna, Gregor Mendel Street 33, 1180 Vienna, Austria; 14Kaposvár University, Faculty of Agricultural and Environmental Sciences, This is the peer reviewed version of the following article: Essl, F. , Biró, K. , Brandes, D. , Broennimann, O. , Bullock, J. M., Chapman, D. S., Chauvel, B. , Dullinger, S. , Fumanal, B. , Guisan, A. , Karrer, G. , Kazinczi, G. , Kueffer, C. , Laitung, B. , Lavoie, C. , Leitner, M. , Mang, T. , Moser, D. , Müller‐Schärer, H. , Petitpierre, B. , Richter, R. , Schaffner, U. , Smith, M. , Starfinger, U. , Vautard, R. , Vogl, G. , Lippe, Accepted M. and Follak, S. (2015), Biological Flora of the British Isles: Ambrosia artemisiifolia. Journal of Ecology, 103: 1069-1098, which has been published in final form at https://doi.org/10.1111/1365-2745.12424. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for self- archiving. Institute of Plant Science, Department of Plant Production and Plant Protection, Guba S. str. 40, 7400 Kaposvár, Hungary; 15Institute of Integrative Biology, ETH Zürich, Universitätsstrasse 16, 8092 Zürich, Switzerland; 16Université de Bourgogne, UMR 1347 Agroécologie, AgroSup/INRA/uB, 17 rue Sully, 21065 Dijon Cedex, France; 17École supérieure d’aménagement du territoire et de développement régional, Université Laval, Québec City, Québec, G1V 0A6 Canada; 18Heinz Maier-Leibnitz-Zentrum, Technische Universität, München, Lichtenbergstraße 1, 85747 Garching, Germany; 19Department of Biology, Unit Ecology & Evolution, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland, 20Faculty of Physics, University Vienna, Boltzmanngasse 5, 1090 Vienna, Austria; 21CABI Switzerland, Chemin des Grillons 1, 2800 Delémont, Switzerland 22Laboratory of Aeropalynology, Faculty of Biology, Adam Mickiewicz University, Poznań, Poland; 23Julius Kuehn Institute, Federal Research Centre for Cultivated Plants, Institute for National and International Plant Health, Messeweg 11/12, 38104 Braunschweig, Germany; 24Laboratoire des Sciences du Climat et de l’Environnement, IPSL, CEA/CNRS/UVSQ, 91191 Article Gif sur Yvette Cedex, France; 25Institute of Ecology, Technical University of Berlin, Rothenburgstrasse 12, 12165 Berlin, Germany; and 26Austrian Agency for Health and Food Safety, Institute for Sustainable Plant Production, Spargelfeldstraße 191, 1220 Vienna, Austria Running head: Ambrosia artemisiifolia †Correspondence author. Email: [email protected] * Nomenclature of vascular plants follows Stace (2010) and, for non-British species, Flora Europaea. Summary 1. This account presents information on all aspects of the biology of Ambrosia artemisiifolia L. (Common ragweed) that are relevant to understanding its ecology. The main topics are presented within the standard framework of the Biological Flora of the British Isles: distribution, habitat, communities, responses to biotic factors, responses to environment, structure and physiology, phenology, floral and seed characters, herbivores and disease, history, and conservation, impacts and management. Accepted This article is protected by copyright. All rights reserved. 2. Ambrosia artemisiifolia is a monoecious, wind-pollinated, annual herb native to North America whose height varies from 10 cm to 2.5 m according to environmental conditions. It has erect, branched stems and pinnately lobed leaves. Spike-like racemes of male capitula composed of staminate (male) florets terminate the stems, while cyme-like clusters of pistillate (female) florets are arranged in groups the axils of main and lateral stem leaves. 3. Seeds require prolonged chilling to break dormancy. Following seedling emergence in spring, the rate of vegetative growth depends on temperature, but development occurs over a wide thermal range. In temperate European climates, male and female flowers are produced from summer to early autumn (July to October). 4. Ambrosia artemisiifolia is sensitive to freezing. Late spring frosts kill seedlings and the first autumn frosts terminate the growing season. It has a preference for dry soils of intermediate to rich nutrient level. 5. Ambrosia artemisiifolia was introduced into Europe with seed imports from North America in the 19th century. Since World War II, it has become widespread in temperate regions of Article Europe and is now abundant in open, disturbed habitats as a ruderal and agricultural weed. 6. Recently, the N. American ragweed leaf beetle (Ophraella communa) has been detected in southern Switzerland and northern Italy. This species appears to have the capacity to substantially reduce growth and seed production of A. artemisiifolia. 7. In heavily infested regions of Europe, A. artemisiifolia causes substantial crop-yield losses and its copious, highly allergenic pollen creates considerable public health problems. There is consensus among models that climate change will allow its northward and up-hill spread in Europe. Key-words: agriculture, biogeography, climate change, ecophysiology, germination, geographical and altitudinal distribution, health, modelling, parasites and diseases, reproductive biology “Ambrosia artemisiifolia wird sich in Mitteleuropa wohl nie in gefahrdrohender Weise vermehren“ [“Ambrosia artemisiifolia will never become dangerously abundant in Central Europe“] (P. Ascherson 1874) Ragweed. Asteraceae, tribe Heliantheae. Ambrosia artemisiifolia L. is a wind pollinated, monoecious annual herb, which germinates in the spring and sets fruit in the autumn. Plants to 2.5 m tall; stems hairy, erect, bluntly 4-angled, ridged and leafy, with several branches; Accepted leaves mostly opposite, alternate above, deltate to lanceolata or elliptic in outline, 25-55(90) x This article is protected by copyright. All rights reserved. 20-30(50) mm, deeply pinnatifid, bases cuneate, margins entire or toothed; abaxial faces sparsely finely hairy or with stiff slender bristles (strigillose), adaxial faces strigillose, both gland-dotted. Inflorescences of two kinds: male capitula short stalked in dense, elongating spike-like ebracteate racemes, female capitula in axillary clusters immediately below the male. Male flowers with cream, yellowish or pale green corolla in drooping short-stalked (2-5 mm) capitula; involucres campanulate or turbinate, 2-3 mm in diameter, glabrous, hispid or finely hairy, florets 12-20, anthers free. Female flowers without corolla or pappus, capitula erect in 2-5 groups, surrounded by small bracts; involucre cupule-like with 5-8 small bristle- like spines (each 3-5 mm) each with single flower. Seeds c. 3-4 mm x 1.8-2.5 mm, enclosed in woody achenes. Fruit yellowish to reddish-brown, ± ovoid, each achene adnate to its involucrum forming a hairy syconium with (4)5-7(8) longitudinal ridges ending in spiny projections. Male flowers produce copious amounts of wind-dispersed pollen. The genus Ambrosia contains at least 40 species, with numerous intraspecific taxa. Its Article centre of diversity comprises the south-western USA and adjacent northern Mexico (FNA Editorial Committee 2006). Only A. maritima L. is native to the Old World (Mediterranean region and tropical Africa), whereas three others native to North America (A. psilostachya, A. tenuifolia, A. trifida) are established in Europe (Rich 1994; Fumanal 2007; Follak et al. 2013). European populations have been distinguished from A. artemisiifolia s. str. as a distinct species (A. elatior L.; see Tropicos 2014). However, genetic studies (Genton et al. 2005; Gaudeul et al. 2011) confirm their conspecific status. Although the native range of A. artemisiifolia is restricted to
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